Super-Soft Silicone: Dr. Brown's teats are made of high-grade silicone, ensuring they are super-soft and gentle on your baby's delicate mouth. Precision Cut: The teats are precision cut to allow for the maximum performance with the flow of liquid, ensuring a consistent and controlled flow rate. Patented Vent System: Dr. Brown's bottles feature a patented two-piece internal vent system that fully vents the bottle for vacuum-free feeding, known as positive-pressure flow. This system helps to reduce air intake during feeding, minimizing the risk of colic and discomfort. Minimizes Oxidation: The vent system prevents air from mixing with the breast milk or formula, minimizing oxidation and helping to maintain essential nutrients like vitamins C, A, and E. Comfortable Feeding: Babies can feed more comfortably without the negative effects of a vacuum or the discomfort of ingesting air bubbles, thanks to the vent system. Prevents Teat Collapse: The design of the vent system ensures that the breast milk or formula flows freely without teat collapse, providing a consistent feeding experience for your baby. Overall, Dr. Brown's Wide Neck Teats Level 2 are designed to offer your baby a comfortable and fuss-free feeding experience while helping to alleviate common feeding issues.